Meteorological elements of pollen concentration forecast

There are many meteorological factors affecting plant pollination, mainly including temperature, humidity, wind and precipitation. Generally speaking, a mild climate is conducive to plant growth. Increase the number and variety of pollen. For example, in the case of partly cloudy but clear skies, the average daily temperature in urban areas rose rapidly from 22 degrees to 30 degrees.

25 degrees, the highest temperature is 25 degrees, and the temperature difference between day and night is large, with an average daily variation of 5 degrees. The wind force is 3, and the good meteorological conditions make the flower sacs of Fraxinus mandshurica and other trees crack quickly. With the slow spring breeze floating in the air, the number of pollen increased rapidly, reaching an average of 30 in ten days. According to Tianjin Evening News, hospitals in Hexi District received treatment.

The number of patients with seasonal allergies is increasing.

Wind and wind direction have obvious effects on the pollen content in the air. In windless or breezy weather, pollen diffusion is limited, and when there is wind, the airflow accelerates, and pollen easily spreads to far places. If the wind is too strong or lasts too long, it is easy to blow the mature pollen in this area to a far place quickly, or even blow off the flower sac, so that the pollen quantity in some areas suddenly drops. For example, there is a sandstorm in Tianjin, and frequent strong winds have blown off the flower sacs of many trees, resulting in a significant reduction in the amount of pollen at the peak of pollen.

Practice shows that precipitation is closely related to plant growth, with abundant rainfall, vigorous plant growth and increased pollen quantity. If plants encounter rainy weather during pollination and the air humidity is high, pollen floats in the air as condensation nuclei, constantly absorbing water vapor in the air, and its weight is also increasing, so pollen can only float near trees. If pollen is washed away by rain, especially after heavy rain or rainstorm, the amount of pollen in the air decreases rapidly.